Descripción

Spirogira – fitoplancton diatomeas – ovario de alga parda, sec. transversal. – hoja de posidonia, sec. transv. – pluma de pavo real, sec. transv. – tallo de laminaria, sec. transv. – corallina officinale – halopteris scoparia – nostoc – ulva, sec. transv. – coadieum variegata, sec. transv. – rizoma de alga.